## ME’scopeVES – Packages

## VT-210 Visual DDA**™**

**Dynamic Data Analysis**

**Time and Frequency Domain Measurements**

- Data imported from most popular single or multi-channel analyzers, recorders, data acquisition systems and portable data collectors
- All popular types of time and frequency domain measurements can be imported
- No limits on the number of measurements or the number of samples per measurement
- Measurements can be displayed in Real, Imaginary, Magnitude (Linear, Log, dB), Phase, CoQuad (Real & Imaginary), Bode (Magnitude & Phase), Nyquist and Orbit Plots
- Measurements can be displayed in Row/Column, Strip Chart, Waterfall, Overlaid or Overlaid by DOF, and Color Map formats
- The measurement display can be Zoomed & Scrolling
- Line, Peak and Band Cursors can be displayed on each measurement
- All graphics can be copied to the Clipboard either as a Bitmap or Metafile
- All spreadsheet properties can be copied and pasted using the Windows Clipboard
- Imports Peak & Phase data for animation of order-based ODS’s
- Imports measurement data from over 40 different third party disk files

**Macro-programs With Hotkeys**

- Macro-programs make it easier to execute repetitive tasks, and to execute a sequence of commands for demonstration purposes.
- A macro-program is a spreadsheet of ME’scope window names and commands. Each line of a macro-program contains an ME’scope data file window and a command to be executed in that window
- When a macro-program is executed, all commands in the macro are executed in sequence from top to bottom
**Hot Keys.**Any macro-program can be executed by pressing its Hotkey on the ME’scope menu bar

## VT-620 Visual ODS**™**

An animated ODS shows how your machine or structure is moving in slow motion. By animating the ODS’s of a structure, you can see what can’t be seen any other way; a structure’s overall motion and the motion of one part relative to another. Excessive vibration levels and loose or damaged parts are easily identified from an animated ODS display.

Visual ODS**™** lets you see how a machine or structure is moving by animating ODS’s directly from a set of time of frequency domain experimental data.

As an example of the practical use of Visual ODS**™**, a blower fan located on the roof of a building was experiencing severe vibration, throwing off belts, and creating high noise and vibration levels throughout the building. All attempts to balance the fan had not solved the problem.

A set of ODS data was taken while the fan was running, using a 2-channel analyzer with a tachometer signal. A set of Peak & Phase data at the operating speed of the motor was acquired. The animated ODS showed that the base of the motor at the end opposite the belt was moving out of phase with the motor. Removing some paint from the base of the motor revealed a previously undetected crack in the motor mount. After repairing the crack, the fan was re-balanced and the severe vibration and noise problem was solved.

**Visual ODS™ Features:**

**Interactive 3D Structure Model**

- Create 3D structure models for displaying ODS’s in animation, using Points, Lines, Surface Triangles, and Surface Quads
- No limits on the model size
- Each Point on the 3D model has its own local measurement axes (in Rectangular, Cylindrical, Spherical or Machine coordinates). Measurement axes are graphically oriented at each Point to match the sensor measurement directions
- The animated display of all un-measured Points & directions is
**interpolated**from the animated motion of nearby measured Points & directions - Light sources are used to make solid models look more realistic
- Photo realistic models (3D models made from digital photographs) provide more realistic animations
- Transparent surfaces allow better clarity of the motion of hidden portions of the structure
- 2D Structure model outlines can be traced from digital photographs or drawings.
- 2D models can be extruded or revolved to create 3D models
- On screen sizing, shaping, positioning and rotation of all drawing objects
- Create Substructures of selected Points, Lines and Surfaces to break complex models into components with simpler geometries. Substructures can also be moved, hidden, and made transparent for better clarity
- Drawing Assistant. Rapidly build 3D models using a library of editable and user-built Substructures
- The 3D model can be displayed in Quad View (X, Y & Z and user interactive 3D View), or in a single View
- Zoom, Pan, Rotate, and change the Perspective distance from the model
- Cut, Copy and Paste drawing objects
- Copy and paste properties in the drawing objects spreadsheet
- The speed of rotational Substructures is synchronized with the speed of order-tracked ODS’s
- Imports Structure models from over 14 different third party disk files

**Time and Frequency Domain Measurements**

- Data imported from most popular single or multi-channel analyzers, recorders, data acquisition systems and portable data collectors
- All popular types of time and frequency domain measurements can be imported
- No limits on the number of measurements or the number of samples per measurement
- Measurements can be displayed in Real, Imaginary, Magnitude (Linear, Log, dB), Phase, CoQuad (Real & Imaginary), Bode (Magnitude & Phase), Nyquist and Orbit Plots
- Measurements can be displayed in Row/Column, Strip Chart, Waterfall, Overlaid or Overlaid by DOF, and Color Map formats
- The measurement display can be Zoomed & Scrolling
- Line, Peak and Band Cursors can be displayed on each measurement
- All graphics can be copied to the Clipboard either as a Bitmap or Metafile
- All spreadsheet properties can be copied and pasted using the Windows Clipboard
- Imports Peak & Phase data for animation of order-based ODS’s
- Imports measurement data from over 40 different third party disk files

**Animated Display of ODS’s & Mode Shapes**

- Interactive sweep, dwell, or static display of ODS’s directly from time or frequency measurements, using the Line, Peak or Band Cursor
- Interactive sweep, dwell, or static display of mode shapes or ODS’s from a shape table
- Shape Interpolation. Geometrically weighted calculation of shape values for unmeasured DOFs using data from nearby measured DOFs
- Comparison display of ODS’s from two Data Blocks or Shape Tables in Side-by-Side or Overlaid format
- Animated shape display using Deformation, Arrows, Text values, or surface Contour Colors with Node Lines
- Animation with persistence for displaying orbit data at each Point.
- Hidden line and transparent surface display for greater clarity
- Digital Movies (Windows WMF’s) can be created during shape animation. Recorded animations can be imbedded in MS Power Point presentations.
- ODS’s and mode shapes can be imported from over 10 different third party disk files

**Macro-programs With Hotkeys**

- Macro-programs make it easier to execute repetitive tasks, and to execute a sequence of commands for demonstration purposes.
- A macro-program is a spreadsheet of ME’scope window names and commands. Each line of a macro-program contains an ME’scope data file window and a command to be executed in that window
- When a macro-program is executed, all commands in the macro are executed in sequence from top to bottom
**Hot Keys.**Any macro-program can be executed by pressing its Hotkey on the ME’scope menu bar

## VT-420 Visual ODS Pro**™**

The** Visual ODS Pro™** package combines all of the features of the **Visual ODS™** package with the features of the **VES-3600 Advanced Signal Processing** option. The **Advanced Signal Processing** option includes an FFT for analyzing data in either the time or frequency domain, plus waveform cut, copy and paste, and many other signal processing, acoustics analysis, and Multiple Input, Multiple Output (MIMO) features.

**Advanced Signal Processing Features:**

- Simultaneous FFT & IFFT on all measurements in a Data Block. The FFT will transform any number of samples, and is not restricted to a power-of-2
- Integration & differentiation of time or frequency signals
- Cut, Copy & Paste of time or frequency signals
- DC Removal of time or frequency signals
- Sort & Select waveforms
- Notch & Band windows for removing unwanted data from time or frequency waveforms
- Force and exponential windows to remove noise and leakage from impulse response measurements
- A flat top window for obtaining accurate narrow band signal amplitudes
- A Hanning window for minimizing leakage effects in frequency spectra
- Calculation of Fourier Spectra, Auto Spectra, PSDs & ODS FRFs from time domain operating data
- Signal processing includes, Rectangular, Hanning, or Flat Top time domain windows, triggering, linear or peak hold spectrum averaging, and overlap processing
- ODS FRFs can be calculated either from Auto & Cross Spectra or from Transmissibility’s and reference Auto Spectra
- Order-tracked ODS’s can be displayed directly from multi-channel Order-tracked response only data
- Block Math functions include complex scaling, add, subtract, multiply, divide, conjugate, and more
- Units conversion and scaling between Linear (RMS) and Power (MS)
- Measurement scaling between Peak, Peak to Peak, and RMS
- Waveform statistics (Minimum, Maximum, Mean Squared, RMS, Variance, Standard Deviation, Absolute Deviation, Power, Linear Power, Crest Factor, Skew, Kurtosis)

**Shape Processing Features:**

- Shape Integration & differentiation
- Shape Cut, Copy & Paste
- Sort & Select of shapes and shape components (DOFs)
- Calculates a shape product, for locating nodal points and lines among all shapes

Acoustic Intensity, Sound Pressure Level (SPL), Sound Power, and ODS’s from either Octave or Narrow Band measurements can also be calculated and displayed in animation. Vibro-acoustic data (acoustics & vibration), can be displayed on the same structure model, thus allowing you to correlate surface vibration with acoustic field measurements.

**Acoustics** **Features**:

- Animated display of vibro-acoustic data (acoustic & vibration)
- 1/1, 1/3rd, 1/12th, 1/24th octave band measurements are displayed in bar chart format
- Magnitudes can be displayed in Linear, Log, dB, dB Reference units
- Acoustic Intensity is calculated from Cross Spectra or time waveforms
- Sound Power through a surface is calculated from Acoustic Intensity
- Narrow band can be converted to octave band measurements
- A, B & C weighting can be applied to narrow band or octave band measurements
- Noise sources can be ranked in a bar chart based on percentage of overall, dB, or watts.
- Measurements can be tone-calibrated, using tone magnitude & phase

VT-420 also includes advanced processing features for calculating multiple Inputs, multiple Outputs or MIMO FRFs. It utilizes a Multiple-Input Multiple-Output matrix model to calculate the following:

**Multiple Forced Responses**. Multiple time or frequency Outputs waveforms are calculated from multiple time or frequency Input waveforms**Force Path Analysis**. Multiple time or frequency Input waveforms are calculated from multiple time or frequency Outputs**MIMO FRFs**. FRFs are calculated from simultaneously acquired multiple Input & Output time waveforms.**Multiple & Partial Coherence**can also be calculated with MIMO FRFs

**MIMO Modeling & Simulation Features:**

- MIMO
**Forced Response**: Calculates multiple response time or frequency waveforms (outputs) caused by multiple excitation forces (inputs), using either FRFs or mode shapes to model the system dynamics - MIMO
**Sinusoidal Forced Response**. Calculates and displays response (output) shapes caused by multiple sinusoidal excitation (input) forces, using either FRFs or mode shapes to model the system dynamics - MIMO
**Force Path Analysis**. Calculates multiple excitation force time or frequency waveforms from multiple response (outputs), using either FRFs or mode shapes to model the system dynamics - MIMO
**FRFs (Transfer functions)**. These frequency functions can be calculated from multiple excitation (input) and response (output) time waveforms, using Rectangular or Hanning time domain windows, triggering, linear or peak hold spectrum averaging, and overlap processing **Multiple and Partial Coherences**. These frequency functions can also be calculated together with MIMO FRFs. Multiple Coherence measures the overall contribution of all measured excitation forces (inputs) to each measured response (output), for each frequency. Partial Coherence measures the contribution of each measured excitation force (input) to each measured response (output), for each frequency.- MIMO
**FRFs (Transfer functions)**can be calculated from multi-channel Auto & Cross frequency spectra

## VT-570 Visual Modal**™**

The **Visual Modal™** package combines all of the features of the **Visual ODS Pro™ **package with the features of the **VES-4000 Basic Modal Analysis** option. The **Basic Modal Analysis** option provides all of the tools you need for extracting modal parameters from experimental vibration measurements (FRFs). With **Visual Modal™ **you can identify the ** frequency, damping & mode shape** of the modes of a structure from experimental data.

Modal parameter estimation (curve fitting) is done in three steps; 1) count the number of modes using a Mode Indicator function, 2) estimate the modal frequency & damping for each mode, 3) estimate a modal residue (a mode shape component) for each mode & each measurement.

**Modal Analysis Features:**

- Mode Indicators for counting modes. Either a Complex Mode Indicator Function (
**CMIF**) or a Multivariate Mode Indicator Function (**MMIF**) can be calculated, and all resonance peaks are counted above a scrollable noise threshold - Frequency & damping curve fitting. Either the Local or the Global MDOF Orthogonal Polynomial method can be used, with extra polynomial terms to compensate for out-of-band modes
- Residue curve fitting. Either the MDOF Orthogonal Polynomial method or the SDOF Peak cursor method can be used
**Quick Fit.**Automatically executes all three curve fitting steps with minimal user interaction- Frequency & damping estimates are graphically indicated on the Mode Indicator graph
- A curve fit function is synthesized and overlaid on each measurement to graphically confirm each curve fit
- Selected measurements and frequency bands can be used to improve modal parameter estimates
- All modal parameter estimates and curve fitting functions are saved with each measurement
- FRFs can be synthesized using modal parameters
- Modal Assurance Criterion (
**MAC**). A bar graph and spreadsheet of the MAC values between all mode shape pairs. If MAC = 1, two shapes are the same. If MAC < 0.9 two shapes are different. - Shape Difference Indicator (
**SDI**). A bar graph and spreadsheet of the SDI values between all mode shape pairs. If SDI = 1, two shapes have the same values. If SDI < 0.9 two shapes have different values - Modal Participation. Displays the Real part, Imaginary part, and Magnitude of the modal participation factors that result when a set of shapes is curve fit to another set of shapes.
- Mode shapes can be re-scaled between Residue and UMM mode shapes
- Modal parameters can be imported & exported using the Universal File Format (
**UFF**) - Mode shapes can be imported from Ansys, Emerson Process Management (CSI), FEMAP, LMS, I-DEAS, NASTRAN, Ono Sokki, Rockwell Automation Emonitor, Spectral Dynamics Star disk files

## VT-550 Visual Modal Pro**™**

The** Visual Modal Pro™** package combines the features of the **Visual Modal™** package with the features of the **VES-4600 Advanced Modal Analysis **option.

The **Advanced Modal Analysis **option includes advanced Multiple Reference curve fitting methods for extracting the modal parameters of ** closely coupled modes or repeated roots** from multiple reference FRF data. This option also includes

**Stability**diagram methods for finding modes in data where two or more modes are represented by a single resonance peak on a Mode Indicator curve.

**Multi-Reference Modal Analysis Features:**

- Mode counting to identify
using either a Multi-Reference Complex Mode Indicator Function (*closely coupled modes & repeated roots***Multi-Ref CMIF**), or a Multi-Reference Multivariate Mode Indicator Function (**Multi-Ref MMIF**) - Curve fitting using the
**Multi-Ref Orthogonal Polynomial**method **Multi-Ref Quick Fit**. Automatically executes three curve fitting steps (count modes, estimate frequency & damping for each mode, estimate residues for each mode) with minimal user interaction- Multi-Reference curve fitting using either the
**Z-Polynomial**, the**Complex Exponential**, or the**Alias-Free Polynomial (AF Poly)**curve fitting method to estimate stable groups of modal frequency & damping (stable pole groups). All poles are displayed on a Stability diagram. **Stability****diagram**. A graphical display of frequency & damping estimates (poles) in differently colored stable pole groups. All poles are calculated using curve fitting model sizes ranging from*1 to a user-defined maximum model size***Stable Poles****diagram**. A graphical display of poles (frequency & damping estimates) in differently colored stable pole groups**Stable Poles Group**. A group of poles on a Stability or Poles diagram that satisfy a user-definedthat lie within user-defined*minimum number of poles**frequency & damping tolerances*- Shape
**Complexity Plot**. A graphical display of the complex shape components of one or more mode shapes - Shape
**Magnitude Ranking**. A graphical display of the ordered magnitudes of the shape components of each mode shape **Shape Expansion**. A set of shapes with many DOFs isto one or more shapes with few DOFs, to create one or more new shapes with many DOFs in them*curve fit*

**VT-550** **Visual Modal Pro™** also includes **Operational Modal Analysis** tools. For cases where the excitation forces cannot be measured and output-only responses are acquired, modal parameters can still be extracted from a set of specially processed Cross Spectra or ODS FRFs, thus providing a complete set of tools for extracting modal parameters from measurements made in any type of testing environment.

Modal parameter estimation (curve fitting) is done in three steps; 1) count the number of modes using a Mode Indicator function, 2) estimate the modal frequency & damping for each mode, 3) estimate a modal residue (a mode shape component) for each mode & each measurement.

**Operational Modal Analysis Features:**

**Deconvolution window**. When this window is applied to a set of Cross Spectra or ODS FRFs, operational modal parameters can be extracted from them using FRF-based curve fitting methods**Modal Model from OMA modes**. A modal model (a scaled set of mode shapes) can be created from a set of output-only operational mode shapes**Mode Indicators**for counting modes. Either a Complex Mode Indicator Function (**CMIF**) or a Multivariate Mode Indicator Function (**MMIF**) can be calculated and displayed. All of the resonance peaks above a scrollable noise threshold are automatically counted**Frequency & damping**curve fitting. Either the**Local**or the**Global Orthogonal Polynomial**method can be used, with extra polynomial terms to compensate for out-of-band modes**Residue**curve fitting. Either the**Orthogonal Polynomial**method or the**Peak Cursor**method can be used**Quick Fit.**With one command,are executed with minimal user interaction*all three curve fitting steps***Frequency & damping estimates**areon the Mode Indicator graph*graphically indicated*- A
**Curve Fit function**ison each measurement to graphically confirm each curve fit*overlaid* measurements and*Selected*can be used to improve your modal parameter estimates*frequency bands*is saved with each measurement*All curve fitting data*- FRFs can be synthesized using the parameters of
modes*selected* **Modal Assurance Criterion (MAC)**. A 3D bar chart or spreadsheet display of the MAC values between all mode shape pairs. If MAC = 1, two shapes are the same. If MAC < 0.9 two shapes are different.**Shape Difference Indicator (SDI)**. A 3D bar chart or spreadsheet display of the SDI values between all mode shape pairs. If SDI = 1, two shapes have the same values. If SDI < 0.9 two shapes have different values**Modal Participation**. A 3D bar chart or spreadsheet display of the Real part, Imaginary part, and Magnitude of the modal participation factors that result when a set of shapes is curve fit to another set of shapes.- Mode shapes can be re-scaled between
**Residue****mode shapes**and**UMM mode shapes** - Modal parameters can be imported & exported using the
**Universal File Format**(**UFF**)

## VT-540 Visual SDM**™**

The **Visual SDM™** package combines all of the features of the **Visual Modal™** package with the features of the **VES-5000 Structural Dynamics Modification **option.

Once you have identified and quantified a resonance problem in a machine or structure, the next question is, “How can the structure be modified to fix the problem?”

**Visual SDM™ **helps you quickly evaluate alternative solutions to resonance problems by adding additional tools to the modal analysis features of a **Visual Modal™** package. The Structural Dynamics Modification (SDM) method allows you to examine the effects of a variety of potential structural modifications on the resonances of a structure without actually having to make the physical modifications.

The resonances (modes of vibration) of a machine or structure depend on its physical properties (geometry, density, elasticity, boundary conditions, etc.). Changing the physical properties of a structure by adding modifications such as stiffeners, brackets, tuned absorbers or other modifications, will directly affect its modes. The SDM method uses industry standard finite elements such as springs, masses, dampers, bars, plates, and solids to model the modifications. These modifications, together with the modes of the original (unmodified) structure, are used to calculate the new modes of the modified structure.

In the example shown below, a stiffener was added across the bottom of an aluminum panel. Adding the stiffener replaced the first mode of the structure (a bending mode at 73Hz) with a torsional mode at 94Hz. The torsional mode was the second mode of the original structure but was not affected by the rib stiffener. Without the added stiffener, machinery in the vicinity operating at 4000-4500 RPM would excite the first bending mode of this panel causing it to resonate. Adding the stiffener not only eliminated the mode at 73Hz, but also eliminated another mode at 143Hz, thus removing a potential resonance problem at 2X RPM as well.

**Structural Dynamics Modification Features:**

- Interactive graphical addition of structural modification elements to a structure model
- All visible FEA elements on a structure model are used by SDM. All hidden elements are ignored
- Modifications can be modeled using the following FEA elements; Point masses, linear springs and linear dampers, rod and beam elements, triangular and quadrilateral plate elements, tetrahedrons, prisms, and brick solid elements
- All finite element properties are displayed and edited in property spreadsheets
- Modal sensitivity analysis. Define a solution space of FEA properties, and calculate new modes that minimize differences with target modal properties
- Sub-structuring. Two or more substructures can be connected together with FEA elements, and the modes of the combined substructures calculated
- Tuned absorbers. Multiple mass-spring-damper vibration absorbers can be attached to a structure model, and the new modes of the structure calculated

**Modal Analysis Features:**

- Mode Indicators for counting modes. Either a Complex Mode Indicator Function (
**CMIF**) or a Multivariate Mode Indicator Function (**MMIF**) can be calculated, and all resonance peaks are counted above a scrollable noise threshold - Frequency & damping curve fitting. Either the
**Local**or the**Global**MDOF Orthogonal Polynomial method can be used, with extra polynomial terms to compensate for out-of-band modes - Residue curve fitting. Either the MDOF Orthogonal Polynomial method or the SDOF Peak cursor method can be used
**Quick Fit**. Automatically executes all three curve fitting steps with minimal user interaction- Frequency & damping estimates are graphically indicated on the Mode Indicator graph
- A curve fit function is synthesized and overlaid on each measurement to graphically confirm each curve fit
- Selected measurements and frequency bands can be used to improve modal parameter estimates
- All modal parameter estimates and curve fitting functions are saved with each measurement
- FRFs can be synthesized using modal parameters
- Modal Assurance Criterion (
**MAC**). A bar graph and spreadsheet of the MAC values between all mode shape pairs. If MAC = 1, two shapes are the same. If MAC < 0.9 two shapes are different. - Shape Difference Indicator (
**SDI**). A bar graph and spreadsheet of the SDI values between all mode shape pairs. If SDI = 1, two shapes have the same values. If SDI < 0.9 two shapes have different values - Modal Participation. Displays the Real part, Imaginary part, and Magnitude of the modal participation factors that result when a set of shapes is curve fit to another set of shapes.

## VT-560 Visual SDM Pro**™**

The **Visual SDM Pro™** package combines all of the features of the **Visual Modal Pro™** package with the features of the **VES-5000 Structural Dynamics Modification** option.

Once you have identified and quantified a resonance problem in a machine or structure, the next question is, “How can the structure be modified to fix the problem?”

**Visual SDM Pro™ **helps you quickly evaluate alternative solutions to resonance problems by adding additional tools to the modal analysis features of a **Visual Modal Pro™** package. The Structural Dynamics Modification (SDM) method allows you to examine the effects of a variety of potential structural modifications on the resonances of a structure without actually having to make physical modifications.

The resonances (modes of vibration) of a machine or structure depend on its physical properties (geometry, density, elasticity, boundary conditions, etc.). Changing the physical properties of a structure by adding modifications such as stiffeners, brackets, tuned absorbers or other modifications, will directly affect its modes. The SDM method uses industry standard finite elements such as springs, masses, dampers, bars, plates, and solids to model the modifications. These modifications, together with the modes of the original (unmodified) structure, are used to calculate the new modes of the modified structure.

In the example shown below, a stiffener was added across the bottom of an aluminum panel. Adding the stiffener replaced the first mode of the structure (a bending mode at 73Hz) with a torsional mode at 94Hz. The torsional mode was the second mode of the original structure but was not affected by the rib stiffener. Without the added stiffener, machinery in the vicinity operating at 4000-4500 RPM would excite the first bending mode of this panel causing it to resonate. Adding the stiffener not only eliminated the mode at 73Hz, but also eliminated another mode at 143Hz, thus removing a potential resonance problem at 2X RPM as well.

**Structural Dynamics Modification Features:**

- Interactive graphical addition of structural modification elements to a structure model
- All visible FEA elements on a structure model are used by SDM. All hidden elements are ignored
- Modifications can be modeled using the following FEA elements; Point masses, linear springs and linear dampers, rod and beam elements, triangular and quadrilateral plate elements, tetrahedrons, prisms, and brick solid elements
- All FEA element properties are displayed and edited in property spreadsheets
- Modal Sensitivity Analysis. Define a solution space of FEA properties, and calculate new modes that minimize differences with target modal properties
- Sub-structuring. Two or more substructures can be connected together with FEA elements, and the modes of the combined substructures calculated
- Tuned absorbers. Multiple mass-spring-damper vibration absorbers can be attached to a structure model, and the new modes of the structure calculated

**Multi-Reference Modal Analysis Features:**

- Mode counting to identify
using either the Multi-Reference Complex Mode Indicator Function (CMIF), or the Multi-Reference Multivariate Mode Indicator Function (MMIF)*closely coupled modes & repeated roots* - Curve fitting using the Multiple Reference Orthogonal Polynomial method
- Multi-Reference Quick Fit. Automatically executes three curve fitting steps (count modes, estimate frequency & damping for each mode, estimate residues for each mode) with minimal user interaction
- Multi-Reference curve fitting using a
**Stability**diagram and either the Z-Polynomial curve fitting method, the Complex Exponential curve fitting method, or the Alias-Free Polynomial (AF Poly) curve fitting method **Stability**A graphical display of frequency & damping estimates (poles) in differently colored stable pole groups. All poles are calculated using curve fitting model sizes ranging from 1 to a user-defined maximum**Stable Poles**A graphical display of poles (frequency & damping estimates) in differently colored stable pole groups**Stable Pole Group**. A group of solutions on a Stability or Poles diagram that satisfy a user-defined minimum number of poles that lie within user-defined frequency & damping tolerances- Shape
**Complexity Plot**. A graphical display of the complex shape components of one or more mode shapes - Shape Component
**Magnitude Ranking**. A graphical display of the ordered magnitudes of the shape components of each mode shape **Shape Expansion**. A set of shapes with many DOFs is curve fit to a set of shapes with few DOFs, to create new shapes with many DOFs in them**Poles**A graph of the modal frequency & damping estimates (poles) of a set of mode shapes.

**MIMO Modeling & Simulation Features:**

- MIMO
**Forced Response**: Calculates multiple response time or frequency waveforms (outputs) caused by multiple excitation forces (inputs), using either FRFs or mode shapes to model the system dynamics - MIMO
**Sinusoidal Forced Response**. Calculates and displays response (output) shapes caused by multiple sinusoidal excitation (input) forces, using either FRFs or mode shapes to model the system dynamics - MIMO
**Force Path Analysis**. Calculates multiple excitation force time or frequency waveforms from multiple response (outputs), using either FRFs or mode shapes to model the system dynamics - MIMO
**FRFs (Transfer functions)**. These frequency functions can be calculated from multiple excitation (input) and response (output) time waveforms, using Rectangular or Hanning time domain windows, triggering, linear or peak hold spectrum averaging, and overlap processing **Multiple and Partial Coherences**. These frequency functions can also be calculated together with MIMO FRFs. Multiple Coherence measures the overall contribution of all measured excitation forces (inputs) to each measured response (output), for each frequency. Partial Coherence measures the contribution of each measured excitation force (input) to each measured response (output), for each frequency.- MIMO
**FRFs (Transfer functions)**can be calculated from multi-channel Auto & Cross frequency spectra

## VT-950 Visual STN**™**

The **Visual STN™** package combines the features of the **Visual ODS™ **package with the features of all of the following **Visual Engineering Series **options;

- VES-3600 Advanced Signal Processing
- VES-4000 Basic Modal Analysis
- VES-4600 Advanced Modal Analysis
- VES-5000 Structural Dynamics Modification
- VES-8000 Finite Element Analysis (FEA) & FEA Model Updating